Modernize the dep that provides imap to make Stackage happy

Author: Mikolaj

horde-ad.cabal

@@ -177,7 +177,7 @@ library
       , enummapset < 0.8
       , ghc-typelits-knownnat < 1
       , ghc-typelits-natnormalise < 1
-      , ilist < 0.5
+      , indexed-traversable < 0.2
       , orthotope < 0.2
       , ox-arrays < 0.2
       , random >= 1.3.0 && < 1.4

src/HordeAd/Core/OpsConcrete.hs

@@ -14,9 +14,9 @@ import Control.Exception.Assert.Sugar
 import Data.Coerce (Coercible, coerce)
 import Data.Foldable qualified as Foldable
 import Data.Function ((&))
+import Data.Functor.WithIndex (imap)
 import Data.Int (Int64)
 import Data.List (foldl', mapAccumL, mapAccumR)
-import Data.List.Index (imap)
 import Data.List.NonEmpty qualified as NonEmpty
 import Data.Map.Strict qualified as M
 import Data.Proxy (Proxy (Proxy))